(a) State one advantage of variation to a species.
(b) What are sex chromosomes? How many sex chromosomes are there? Name them.
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Answer:
- Helps in production of offsprings.
- Sex chromosomes are the chromosomes which take part in the reproduction. There are 2 sex chromosome, XX female and XY male.
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Explanation:
a/ Variation is important for any species because it allows the species to adapt to a changing environment. Also, the presence of diseases and parasites maintains variation in a species, particularly those associated with blood groups.
b/ In the XY system, males contain one X and one Y chromosome, while females contain two X chromosomes. Thus, males are considered heterogametic – they can produce two different types of gametes, depending on whether the sperm carries an X or a Y chromosome. Females are homogametic – all their eggs carry one X chromosome.
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